#include<bits/stdc++.h>
using namespace std;
int main(){
	int a=0,c=0,b=1;
	cin>>a;
	while(b<=a){
		c=c+b*b;
		b++;
	}
    cout<<c;
}
/**************************************************************
	Problem: 1054
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/